Firmware & FS Files needed for K750

Hi,

I need Firmware & FS Files for my K750 with following discriptions:

21:14:52| ++++++++++++++++++++++++++++++++++
21:14:52| PHONE INFO
21:14:52| ++++++++++++++++++++++++++++++++++
21:14:52| DBID: db2010
21:14:52| OTP CID: 49
21:14:52| EROM CID: 49
21:14:52| EROM color: Brown
21:14:52| IMEI: 35967200xxxxxx
21:14:52| Phone: W800
21:14:53| Operator: VFE_2
21:14:53| CDA: CDA102338/144 R2A
21:14:53| Firmware: R1CA021
21:14:53| EROM: n/a
21:14:53| ++++++++++++++++++++++++++++++++++

I accidently flashed my mobile & removed the cable instantly. Now someone has told me to flash my mobile. but i cant find these files. i hv gone through a tutorial of flashing the mobile with XS++.

Flash To K750 R1ca021 - Top Sony Forums

But i cant understand what is Customizing FS. Plz help me.